Milling-machine.



APPLICATION FILED DEC-27. I9I2- 1. BOWEN.

MILLING MACHINE.

Patented Mar. 28, 1916.

3 SHEETS-SHEET I.

w full/123W III IW/MII HIS ATTORNEY J. BOWEN.

yMILLING MACHINE.

AlhFLICATlON FILED DEC.2?, 1912. 1,177,376.. Patented Mar. 28, 1916.

WITNESSES INVENTQR J. BOWEN.

MILLING MACHINE. APPLICATION FILED DI-:c.21, I-sIz.

Patented Mar. 28 1916.

3 SHEETS-SHEET 3.

f3 'wITNI-:es'Es 1 I INvENToR I. JAMES Bowan BY HIS ATTORNEY mia-6m A :raices BOWEN, or MANHEImrENNsYLvANIA.

. MILLING-MACHIN E.

Specification of Letters Patent.

Patented Mar. 28, 1916.

'Application led December 27, 1912. Serial N o. 738,882.

To czZZ whom 'it may concern Be it known that I, JAMES BOWEN, a citizen of the United States, residing in 'Manheim, Lancaster county, Pennsylvania, have I a milling machine of relatively simple construction and capable of ready adaptation to the performance of different classes of work. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a front elevation of a milling machine constructed in accordance with my invention; Fig. 2 is an end view of the same looking in the direction of the arrow w, Fig. 1; Fig. 3 is a plan or top view of the machine with part of the mechanism removed therefrom; Fig. 4 is a transverse section of part of the tripping mechanism of the machine, and Fig. 5 is an enlarged section of an attachment permitting the use of a different form of milling tool from that shown in Fig. 2.

In the drawing, 1 represents the Xed base or hed of the machine having a superstructure 2 on which are formed guideways for a longitudinally traveling carriage or workholder 3, longitudinal movements being iinparted to the latter by means of a longitudinally extending feed screw 4 mounted at each end in bearings on said superstructure 2 and engaging a nut on the carriage, as

usual, rotative movement being imparted tov this feed screw either by means of power Y l applied to a worm wheel 5 at one end of the same, or by means of a hand wheel or crank applied directly thereto at the other end, or by means of a hand-operated shaft 6 and bevel wheels 7 and 8 at the latter end.

The work may be clamped directly to the carriage 3 when surface milling is to-be performed or the work may be caused to rotate in respect to the milling tool if desired, the carriage 3 inthe latter case being provided with a head stock 9, a tail lstock 10, and a work-carrying shaft 11, the latter being free to rotate in the head stock 9 and to 'slideV through a sleeve 72 which can rotate in a hearing 12 on the superstructure 2 as shown in Fig. 1, said shaft 11 being splined to the sleeve 72 so that it is compelled to rotate therewith. The shaft 11 is tubular so that, if 'desired,lthe work can be introduced or removed through the same.

Secured to the sleeve 72 is a worm wheel 14, driven by a worm 15 on a shaft 16 and the worm wheel 5' on the feed screw 4 is driven by a worm 17 on a shaft 18, said .shafts 16 and 18 being adapted to'iXed bearlngs. at their rear ends but having forward bearings in a frame 19 which has a depending stem 202l guided vertically in a hollow stud 20 on the superstructure 2 and suscep-v tible of being raised and lowered by reason of itsengagement witha lever 21 pivoted to one end of the structure 2 and adapted to be engaged by a trigger 22 at one end of a shaft 23, the latter being free to turn in bearings on the front of the structure 2 and being'provided with a handle 24, whereby it can be readily manipulated so as to cause the triggerto engage with the outer end of the lever 21 and thereby raise its inner end, and also the 'frame 19 with which it engages, to such position as to cause the worms 15V and 17 to mesh with the worm wheels 14 andr 5, respectively, as shown in Fig. 2, movement of the shaft 23 so as to trip the' trigger 22 permitting the frame 19 to fall so as to` carry the worms l'and 17 out of mesh4 with the Worm Wheels 14 and 5, respectively, and thereby stop'the operation of the feed screw 4 and Work-'carrying shaft 11. In order to permit` such rising and falling move- Yment of theworms 15. and 17 the shafts 16 and18 have universal joint sections 161and 18%- as shown in Fig. 2.

The shaft 18 is driven from va shaft 25 at the back of the machine through the medium of bevel the shaft 16 is driven from the shaft 18 through the medium of a train of spur gears 28, 29 and 30, so that by a suitable proportioning-,of these gears the speed of rotation of the shaft 16 and consequently of the work-carrying shaft 11 can he accurately regulated in respect to the speed of rotation of the shaft'lS and feed screw 4,. or'the rotation of the shaft lcan be stopped without stopping, the rotation of the shaft 18..

Power is applied to the machine in any desirable way, as for .instance by means of a driving haiti-applied to a pulley 31 on a `4shaft -32 which is adapted' to a hearing in the overhangmg standard 33 mounted upon gears 26 and 27 (Fig.2) and a bracket at me rear of the `structure 2,'this shaft also carrying a stepped pulley 34 in line with a reversely stepped pulley 35 car-r ried by a shaft 35a adapted to bearings in the rear overhang of the standard 33, this shaft also having another stepped pulley 3G for driving a reversely stepped pulley 37 on the shaft 25, as shown in Figs. 2 and 3. The speed of rotation of the shaft 25 in respect to that of the 'shaft 32 can, therefore, be readily regulated by shifting the belt'upon the stepped pulleys 3l and or -upon the stepped pulleys 3G and 37, or both.

At the rear of the machine is a vertically projecting post l0 which is free to slide back and forth upon guides at the top of a rearward extension lf*V on the bed plate l. such movement being imparted to the post by means of a feed screw 41 which can be. operated by a hand wheel 42 at the front of the machine, and said post 40 has, on its forward face, guides for a vertically movable slide 3 which can be raised and lowered by means of a feed screw ll driven by means of bevel gears 45 and 4G from a shaft -L7 mounted in bearings on a plate 4S projecting forwardly from the upperA end of the post 40, said shaft 47 having a lhand wheel 49 whereby it can be readily manipulated.

The slide 423 has a forwardly projecting arm 5() terminating in a circular head 5l and from the latter is suspended. by a suitable axial pivot, a turntable which carries depending bearings 53 for tlie shaft 5l of thel milling tool and also an upper bearing 56 for a shaftfiT, the latter being in driving connection with the shaft 5J( through the medium of a train of spur gears 5S. A

The shaft 57 is driven from the shaft 32 through the medium of a bevel wheel G() on said shaft 32. a bevel wheel (l1 on the shaft 57 and a duplex bevel pinion (S3-(il mounted so as to turn loosely on the pivot shaft of the turntable 52, the bevel wheel GO meshing with the member (l of said duplex bevel pinion and the bevel wheel (3l meshing with thi` nieinber'lll thereof. as shown in Fig. il.

rl`lie turntable 52 carries a graduated scale so that the axis of the milling tool shaft 5l can be accurately adjusted to any desired degree in respect to the axis ot' the workcai'ryiiig shaft 1l, or to the longitudinal line of movement of the carriage il iii ease said shaft is not employed. so that if. for iiistance, a spiral groove or slot is to be eut iii the work carried between theliead land tail sticks ll and y1()tlie milling tool 55 can be adjusted to the angle corresponding to tho pitch of .said spiral slot or groove, the. latter being determined by the relative speed ol' rotation of the feed screw -l and workearryiiig shaft ll. rthe i'rtai'y adjustment ol the turntable 52 and of the. shafts and gearing carried thereby can be eliected withthe bevel the out deranging any of said gearing, wheels 63 and G-'l being concentric with axis of rotationof the turntable.

In order to compensate for the rising and falling'movement of the slide 43, the driving shaft- 32 has a universally pivcted and telescopic section 65, as shown in Fig. 3, and in order to provide for the automatic tripping of the trigger 22A so as to automatically disconnect tlie driving worms 15 and 17 from the worm v-Jheels ll and 5, respectively, when the carriage 3 reaches either limit of its longitudinal movement, the trigger carrying shaft '23 is provided with a lug 66 (Fig. el) normally in engagement with a pawl'67 on a slide rod 68 mounted in bearings at the frontof the structure 2 and carrying longitudinally adjustable tappets (39 which may be struck by a suitable projection G9 on the carriage 3 when the latter reaches either termination of its longitudinal movement, thereby moving the pawl 67 out of engagement with the lug 66 and permitting the latter, imder the stress ofa suitable spring S0 to partially rotate the shaft 23 so as to withdraw the trigger 22 from engagement with the lever 21.

ll'hen .it is not desired to rotate the work which is being acted upon by the milling tool the shaft l1 can be readily removed, the bearing 12 and head stock J being mount ed so as to be quickly detachable from the structure 2 and carriage Saud the tail stock Y l0 is pivoted by means of a bolt 70 and is held in place by means of a locking bolt 71 whereby, when the nut on the latter is slackened. the tail steek may be swung around on its pivot bolt 70 so as to be out of the way.

When it is desired to employ a milling tool having a vertical. axis in place of one having a horizontal axis the tool-carrying member .of the shaft 5l and the inner bearing 53 of the latter may be removed and a hanger 73,'such as shown in Fig, 5, may be substituted `for said bearing 53, this hanger having bearings for the vertical shaft 7l of the milling tool 75, `which shaft has secured.

to it a bevel wheel 76 meshing with a bevel pinion 77 secured to a stud lwhich is thread-` i ed` as shown at 78, for being screwed into the end of the driving section of the shaft 54. The capacity of my improved machine for performing a wide range of work will be evident when it is borne in mind that the milling tool may be caused to rotate either about a horizontal or a vertical axis, said tool can be adjusted to any desired position iii respect to the work, the latter may be either fixed or caused to rotate, and, in the latter rase, the speed of its rotation in respect to the speed of the longitudinal movement can be varied to any extent desired.

l claim:

The combination, in a milling machine, of

ay fixed bed, a. longitudinally movable cai-,

riage on said bed, a vertically projecting post laterally movable on said bed, a vertically movable slide on said post, said slide having an arm projecting over the longitudinally movable carriage on the bed', a turntable mounted so as to rotate abouta vertical axis on said projecting arm, a tool carrying shaft mounted in bearings depending from said turntable, said shaft having a horizontal axis, a driving gear Wheel rotating about a fixed axis coincident with the axis of the turntable, gearing `carried by and movable With the turntablejand'serving to transmit the movement of' said driving gear Wheel to the tool carrying shaft on the turntable, a

Work holding shaft mounted to rotate in bearings on the longitudinally moving carriage,` said shaft being longitudinally movable with said bearings, and a rotating device for said shaft mounted in bearings on the fixed b'ed and through which said Work holding shaft can move longitudinally.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

JAMES BOWEN. 4Witnesses:

" M. T. WILLIAMS, SUE M. STRoH. 

